<template>
  <view v-if="goods_info.goods_name" class="goods-info-container">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000">
      <swiper-item v-for="(item,i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" mode="widthFix" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 价格区域 -->
      <view class="goods_price">￥{{goods_info?.goods_price}}</view>
      <!-- 主体内容区域 -->
      <view class="goods-info-body">
        <!-- 商品名称区域 -->
        <view class="goods_name">{{goods_info.goods_name}}</view>
        <!-- 收藏区域 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费区域 -->
      <view class="freight">快递：免运费--{{cart.length}}</view>
    </view>

    <!-- 图文详情区域 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>

    <!-- 商品导航区域组件 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import store from '../../store/store.js'
  export default {
    computed: {
      username() {
        return store.state.username
      },
      cart() {
        return store.state.cart
      },
      total() {
        return store.getters.total
      }
    },
    watch: {
      // 定义 total 侦听器，指向一个配置对象
      total: {
        // handler 属性用来定义侦听器的 function 处理函数
        handler(newVal) {
          const findResult = this.options.find(x => x.text === '购物车')
          if (findResult) {
            findResult.info = newVal
          }
        },
        // immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
        immediate: true
      }
    },
    data() {
      return {
        // 商品详情信息
        goods_info: {},
        options: [{
          icon: 'chat',
          text: '客服'
        }, {
          icon: 'shop',
          text: '店铺',
        }, {
          icon: 'cart',
          text: '购物车',
          info: this.total
        }],
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: 'linear-gradient(90deg, #FFCD1E, #FF8A18)',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: 'linear-gradient(90deg, #FE6035, #EF1224)',
            color: '#fff'
          }
        ],
      };
    },
    // options是路径上携带的参数
    onLoad(options) {
      this.goods_id = options.goods_id
      this.getGoodsDetail(this.goods_id)
    },
    methods: {
      addToCart(goods) {
        store.commit('addToCart', goods)
      },
      // 获取商品详情信息方法
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        // 使用字符串的 replace() 方法，为 img 标签添加行内的 style 样式，从而解决图片底部空白间隙的问题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;"')
          .replace(/webp/g, 'jpg')
        this.goods_info = res.message
      },
      // 轮播图预览方法
      preview(i) {
        uni.previewImage({
          // 当前预览图片的索引
          current: i,
          // 所有图片 url 地址的数组
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      // 左侧导航点击事件 跳转到购物车|店铺页面
      onClick(e) {
        if (e.content.text === '购物车') {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      // 右侧按钮的点击事件处理函数
      buttonClick(e) {
        // 1. 判断是否点击了 加入购物车 按钮
        if (e.content.text === '加入购物车') {
          // 2. 组织一个商品的信息对象
          let goods = {
            goods_id: this.goods_info.goods_id, // 商品的Id
            goods_name: this.goods_info.goods_name, // 商品的名称
            goods_price: this.goods_info.goods_price, // 商品的价格
            goods_count: 1, // 商品的数量
            goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
            goods_state: true // 商品的勾选状态
          }
          // 3. 通过 this 调用映射过来的 addToCart 方法，把商品信息对象存储到购物车中
          this.addToCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .goods_price {
      color: #c00000;
      font-size: 18px;
      margin-bottom: 10px;
    }

    .goods-info-body {
      display: flex;

      .goods_name {
        font-size: 13px;
        margin-right: 20px;
      }

      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #e4e4e4;
        color: gray;
      }
    }

    .freight {
      margin-top: 10px;
      color: gray;
      font-size: 12px
    }
  }

  .goods_nav {
    position: fixed;
    bottom: 0px;
    left: 0px;
    width: 100%;
  }

  .goods-info-container {
    margin-bottom: 50px;
  }
</style>